<ion-header>
  <ion-navbar>
    <ion-title>
      Demo
    </ion-title>
  </ion-navbar>
</ion-header>

<ion-content padding>
demo
<button ion-button (click)='openCamera()'>openCamera</button>
<button ion-button (click)='selectPic()'>select image</button>
<button ion-button (click)='previewPic()'>previewPic</button>

</ion-content>
